不韋 呂
/
UIT2_CombReverb
Reverb system using single comb filter for ST Nucleo F401RE.
Diff: main.cpp
- Revision:
- 0:e2e604ed785d
- Child:
- 2:501cd3d93dd7
diff -r 000000000000 -r e2e604ed785d main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Fri Oct 31 07:56:04 2014 +0000 @@ -0,0 +1,50 @@ +//-------------------------------------------------------------- +// Reverb system using comb filter +// 2014/10/31, Copyright (c) 2014 MIKAMI, Naoki +//-------------------------------------------------------------- + +#include "mbed.h" + +#include "ADC_Base.hpp" // for ADC not using interrupt +#include "DAC_MCP4922.hpp" // for DAC MCP4922 +#include "ScfClockTim3.hpp" // for clock supplied to SCF + +using namespace Mikami; + +const int FS_ = 12000; // Sampling frequency: 12 kHz +ADC_Base adc_(A0, FS_); // for AD +DAC_MCP4922 myDac_; // for DA + +const float G_C_ = 0.8f; +const float G0_ = 2.0f*(1.0f - G_C_); +const int M1 = 1153; +float ynD[M1]; + +DigitalIn sw_(D2, PullDown); + +int main() +{ + ScfClockTim3(500000); // cutoff frequency: 5 kHz + + for (int n=0; n<M1; n++) ynD[n] = 0.0f; + int nD = 0; + + while (true) + { + float xn = adc_.Read(); // Read from A0 + //----------------------------------------------- + + float yn; + if (sw_.read() == 1) + { + yn = ynD[nD]; + ynD[nD++] = G0_*xn + G_C_*yn; + if (nD >= M1) nD = 0; + } + else + yn = xn; + + //----------------------------------------------- + myDac_.Write(yn); // Write to DAC + } +}